They replace your old Marvin windows with new ones. They replace the old and defective Marvin windows with energy star product. These ratings are the U-factors and solar heat gain coefficient. It measures the resistance of the amount of heat flowing from a window. The Marvin windows with a lower U-factor ensures that there is no heat loss. This in turn measures the amount of solar the window can transmit. Contrary to the U-factor, the solar heat gain coefficient will need to be higher.
Some might say that it is very expensive to replace all the Marvin windows in the house. They block the unwanted air from coming into your house. The films give natural ways to access the light.
It is therefore good for you to have those air leaks fixed. The air leaks will also allow the heat inside the rooms leave the house. This will in turn make the heater working throughout the day and night, and this means more money. This time the replacement will be done earlier than anticipated. You should get your home checked for any cracks and leakages.
Solar energy is a much safer way of heating up your home. The process of burning fossil fuel generating gases that are harmful to the environment. There are no dangers associated with this kind of energy. When you buy a solar panel system for your home, you will be able to get the best energy from that. The solar panel is also cost effective.